Control device for use with a fuel injection pump

ABSTRACT

A control device for use with a fuel injection pump having a throttle control and a stop control includes a lever connected to the stop control, resilient means biasing the lever to a position in which the supply of fuel to the engine is prevented. Also provided is a second lever connected to the throttle control of the pump and which can engage a pin carried by the lever. The pin is movable by means of the lever into contact with a stop and in this position fuel can be supplied to the engine. When the stop is released the pin is released and the lever returns to a position in which no fuel will be supplied to the engine.

O Umted States Patent 11 1 1111 3,774,467 Leonard Nov. 27, 1973 [54]CONTROL DEVICE FOR USE WITH A FUEL 3,392,526 7/1968 Kataoka 74/469INJECTION PUMP 3,402,792 9/1968 Masser 74/469 3,456,523 7/1969 Stepaneret a]. 74/479 Inventorr Gordon Harris Leonard, Chalfom 3,496,795 2/1970Dinnendahl..... 74/469 St. Peter, England 3,679,809 7/1972 Wertman74/469 [73] Assignee: G. A. V. Limited, Birmingham,

England Primary Exam1ner-Charles J. Myhre Assistant Examiner-Wesley S.Ratliff, Jr. [22] Filed: 1971 Att0meyHolman & Stern [21] Appl. No.:204,609

[57] ABSTRACT [30] F i A li ti P i it D t A control device for use witha fuel injection pump Dec. 11, 1970 Great Britain 58,919/70 havingthmtfle control and 3 mp includes a lever connected to the stop control,resilient means 52 US. Cl. 74/469, 123/179 L biasing the a which ShPPlY0f [51] Int. Cl G05g 1/00 fuel to the engme is prevented pmvlded a 58Field of Search 74/469, 479; lever whhected the hmtfle comm 0f the123/179 L pump and which can engage a pin carried by the lever. The pinis movable by means of the lever into contact [56] References Citedul'lith a stop awih in thl'ils position fupl car; bi supplied to t e enine, en t e sto is re ease t e in is re- UNITED STATES PATENTS leasedind the lever returss to a position in :vhich no 3,101,821 8/1963 Henry74/479 fuel will be Supplied to the engine 3,263,516 8/1966 Chisholm....74/469 3,273,679 9/1966 Uher 74/479 8 Claims, 2 Drawing Figures CONTROLDEVICE FOR USE WITH A FUEL INJECTION PUMP This invention relates to acontrol device for use with a mechanism of the kind including a firstcontrol member for effecting a first control operation and a secondcontrol member which is movable to effect a second control operation.

The object of the invention is to provide a control device for use withsuch a mechanism, whereby the second control member is automaticallymoved to a first predetermined position irrespective of the setting ofthe first control member, in the event of a catch contained in thedevice being released.

According to the invention a control device for use with a mechanism ofthe kind specified comprises in combination, a first lever which in use,is operatively connected to said second control member, resilient meansbiasing said first lever to a first position in which the second controlmember will be moved to said predetermined position, and a releasablecatch operable to retain said first lever in a second position in whichthe second control member assumes a second predetermined position.

One example of a control device in accordance with the invention willnow be described with reference to the accompanying drawings which showa device for use with a mechanism comprising a fuel injection pump.

FIG. 1 is an inverted plan view of the device and,

FIG. 2 is a side view in a direction of the arrow A of FIG. I.

With reference to the drawings there is provided a first control memberin the form of a lever 4 which is mounted upon a shaft 12. The shaft 12is mounted in a bearing and is operatively connected to a stop controlof a liquid fuel injection pump. The lever 4 is loaded by a coiledtension spring 10 to a position as shown in the drawings, in which thestop control prevents the supply of fuel by the pump. The lever 4 isalso provided with an elongated slot 3 through which extends a pin2. Thepin 2 is slidable within the slot 3 and includes a head 2a which islocated within a shaped groove 16 which is formed within a generallyrectangular block 1 forming part of the device.

Also provided is a second control member in the form of a lever which ismounted upon a shaft 13 and the shaft 13 is operatively connected to thethrottle control member of the fuel pump. The position in which thelever 5 is shown is the minimum or idling position of the throttlecontrol member, and movement of the throttle control to effect anincrease of fuel will effect movement of the lever 5 inthe clockwisedirection. The free end of the lever 5 is formed as a pivotal latch 11bears against the pin 2.

The groove 16 is specially shaped and includes a first portion 17 whichis of arcuate form and has a radius which is struck from the centre ofthe shaft 13. The ra dius of the portion 17 is however less than thelength of the lever 5. The groove portion 17 is extended at oppositeends by curvedportions l8 and 19, portion 18 being shorter than portion19. Moreover, extending across the groove atthe junctions of theportions 18 and 19 thereof is a catch member 7. The catch member 7 isloaded by a coiled compression spring 9 to an inoperative position inwhich it is withdrawn from across the groove and it is retained in itsoperative position as shown, by energisation of a solenoid 8.

The operation of the device will now be described. In the position shownthe associated pump cannot supply fuel because of the position of thelever 4. In order to start the engine to which fuel is supplied thelever 5 must first be moved in the clockwise direction and this has theeffect of moving the pin 2 along the portion 17 of the groove 16. Inaddition the lever 4 is moved against the action of the spring 10.During movement of the pin a leaf spring 6 is tensioned and when thelever reaches the junction of the portions 17 and 18 of the groove thespring 6 moves the pin 2 along the portion 18 thereby releasing the pinfrom contact with the lever 5. The pin 2 comes to rest against the catchmember 7 and in this position the lever 4 is retained in a position inwhich the pump can supply fuel. Moreover, the lever 5 is free to movewhen the throttle control member of the pump is set to provide themaximum fuel in which position the lever 5 will assume a position aboutremoved in the clockwise direction, from the position in which it isshown.

In the event that the solenoid 8 is de-energised in th event of a faultcausing interruption of the electric supply or deliberately by theoperator the catch member 7 will release the pin 2 and the lever 4 willmove back under the action of the spring 10 to the position shownthereby preventing further supply of fuel. The sequence described mustthen be repeated to enable the engine to be operated normally. However,for emergency operation it is possible to set the throttle member to thehalf throttle position to allow the engine to be started. In thisposition the pin 2 is still in the portion 17 of the groove but thelever 4 has been moved an amount sufficient to allow flow of fuel. Thelatch 11 on the lever 5 allows the lever 5 to be re-engaged with the pin2 in the event that the catch member 7 has been operated.

FIG. 1 shows the provision of a further catch member 14 mounted on apivot 15 and operated by the catch 7. The catch member 14 is moved to aposition to prevent the pin 2 reaching the junction of the grooveportions 17 and 19, when the catch member 7 is released. In this casetherefore the engine cannot be started until the catch member 7 isre-set.

I claim:

1. A control device for use with a mechanism of the kind including afirst control member which is movable to effect a second controloperation, the control device comprising in combination, a first leverwhich is operatively connected to said second control member, resilientmeans biasing said first lever to a first position in which the secondcontrol member will be in a first and a releasable catch operable toretain said first lever in a second position in which the second controlmember will be in a second predetermined position.

2. A control device according to claim 1 including a pin movable withsaid first lever, said pin when said first lever is in said secondposition being engaged with said catch.

3. A control device according to claim 1 including a slot formedin saidfirst lever, said pin being located within said slot, a block having aface, a guide groove formed in the face of said block, and a headportion on said pin, said head portion being engaged within said guidegroove.

4. A control device according to claim 3 including a second lever, saidsecond lever in use, being operatively connected to said first controlmember, said second lever when said first lever is in said firstposition being operable to move the pin along a first portion of saidguide groove and resilient means operable when the pin reaches the endof said first portion of the groove, to effect movement of the pin alonga second portion of the guide groove into engagement with said catch,said pin during this movement being disengaged from said second lever.

5. A control device according to claim 4 including a third portion ofsaid guide groove interconnecting the free ends of said first and secondportions thereof, said pin moving along said third portion of the guidegroove when said catch is released.

6. A control device according to claim 5 in which said second lever isprovided with a latch at its end for engagement with said pin, saidlatch pivoting to allow the second lever to return to its initialposition when the pin is released by the catch.

7. A control device as claimed in claim 6 in which said catch is springloaded to a position out of the path of said pin, electromagnetic meansbeing provided to urge the catch into a position to engage said pin.

8. A control device as claimed in claim 7 including a further catchoperable to prevent said pin moving to the start of said first portionof the guide groove when said first mentioned catch is out of the pathof said pin.

1. A control device for use with a mechanism of the kind including afirst control member which is movable to effect a second controloperation, the control device comprising in combination, a first leverwhich is operatively connected to said second control member, resilientmeans biasing said first lever to a first position in which the secondcontrol member will be in a first and a releasable catch operable toretain said first lever in a second position in which the second controlmember will be in a second predetermined position.
 2. A control deviceaccording to claim 1 including a pin movable with said first lever, saidpin when said first lever is in said second position being engaged withsaid catch.
 3. A control device according to claim 1 including a slotformed in said first lever, said pin being located within said slot, ablock having a face, a guide groove formed in the face of said block,and a head portion on said pin, said head portion being engaged withinsaid guide groove.
 4. A control device according to claim 3 including asecond lever, said second lever in use, being operatively connected tosaid first control member, said second lever when said first lever is insaid first position being operable to move the pin along a first portionof said guide groove and resilient means operable when the pin reachesthe end of said first portion of the groove, to effect movement of thepin along a second portion of the guide groove into engagement with saidcatch, said pin during this movement being disengaged from said secondlever.
 5. A control device according to claim 4 including a thirdportion of said guide groove interconnecting the free ends of said firstand second portions thereof, said pin moving along said third portion ofthe guide groove when said catch is released.
 6. A control deviceaccording to claim 5 in which said second lever is provided with a latchat its end for engagement with said pin, said latch pivoting to allowthe second lever to return to its initial position when the pin isreleased by the catch.
 7. A control device as claimed in claim 6 inwhich said catch is spring loaded to a position out of the path of saidpin, electromagnetic means being provided to urge the catch into aposition to engage said pin.
 8. A control device as claimed in claim 7including a further catch operable to prevent said pin moving to thestart of said first portion of the guide groove when said firstmentioned catch is out of the path of said pin.